clairenooga on "[Plugin: Contact Form 7] Three column contact form"

I found how to create a two-column form from here: http://wordpress.org/support/topic/plugin-contact-form-7-adjusting-the-layout?replies=10
But I would like three columns because two doesn't look right with my website layout (see here: http://www.clairewickenden.com/contact-us/ )
How can I create three columns to fix this?

http://wordpress.org/extend/plugins/contact-form-7/